Malicious PDF — malware analysis report

Static analysis result for SHA-256 280f0ced5233ef52…

MALICIOUS

PDF

45.4 KB Created: 2020-08-06 03:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3613e28f49f3934cfec5a80750a518bf SHA-1: 81f68b3ff7e1d522adfe5e84b13c4315ef83e345 SHA-256: 280f0ced5233ef52a2ba1b30ef6beda97f1b1b6fc2434579b4e6795578ba547e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, many of which point to a link farm designed to redirect users. One prominent link, "https://ttraff.ru/pify?keyword=basic+epidemiology+book+pdf", is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a lure to download further malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=basic+epidemiology+book+pdf
    • http://files.sacredhuman.co.uk/uploads/1/3/1/8/131872107/lozonopubov.pdf
    • http://files.orourkewellnesscenter.com/uploads/1/3/1/3/131379246/kebupe_girenuxasirupo_meposubawagoko_saronomi.pdf
    • http://files.monicazinn.com/uploads/1/3/2/7/132712251/diveluterilo.pdf
    • http://pokifelas.herbivoreresearch.com/uploads/1/3/1/3/131380005/dawomuginebaf.pdf
    • http://files.moveoutofmass.com/uploads/1/3/1/0/131069898/9981506.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/97504376618.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/5980235943.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/bevogixokakibebusute.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8281/files/9962265907.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zijilo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/rafeju.pdf
    • https://cdn.shopify.com/s/files/1/0427/4490/5884/files/tosijenejiwilisoza.pdf
    • https://cdn.shopify.com/s/files/1/0437/8814/0696/files/96893917722.pdf
    • https://cdn.shopify.com/s/files/1/0428/1729/0407/files/psychology_myers_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/4557/7116/files/mutodawizetanadosowirirod.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/32517018889.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006461.bin
b800c91bacd0b026bac22aed39c32b22283f549781dd740d622adc1fcd101781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6461 3468 bytes
font_01_sfnt_off000070d8.bin
d2e835ee8d49f701043101871b836d910fd5a8498654de130567c1dcbeaaed8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D8 5736 bytes
font_02_sfnt_off00008463.bin
ac89463573f122bde68cea8b7f756aa62f3b5a08101bf50a3551eb791ef5dcc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8463 10708 bytes

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